Your argument is analogous to saying--- IITs and BITS are not really good. They are so only because of their stringent selection process.--- These go hand in hand. The school and its teachers produce good results, hence the students compete hard to get admitted in to this school. And hence there is a selection process. Its inevitable. And, maximum preferrence is given to those students who opt to continue in the school after the Xth. Only the remaining seats are filled by a stringent selection process to accomodate students applying from other schools
